#include <bits/stdc++.h>
#include <atcoder/modint>
using namespace std;
using namespace atcoder;

using mint = modint998244353;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int m, n, h; cin >> m >> n >> h;
    vector<string> s(m);
    for (int i = 0; i < m; i++) {
        cin >> s[i];
    }
    vector dp(m, vector(n, vector<mint>(h + 1)));
    dp[0][0][h] = 1;
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {
            if (s[i][j] == '#') {
                continue;
            }
            for (int k = 1; k <= h; k++) {
                if (i > 0 && (k < h || s[i][j] == '.')) {
                    dp[i][j][k] += dp[i - 1][j][k + (s[i][j] == 'o')];
                }
                if (j > 0 && (k < h || s[i][j] == '.')) {
                    dp[i][j][k] += dp[i][j - 1][k + (s[i][j] == 'o')];
                }
            }
        }
    }
    cout << accumulate(dp[m - 1][n - 1].begin(), dp[m - 1][n - 1].end(), mint(0)).val();
}